“On The Fly” Diesel exhaust fills the air as a three-unit helper set, led by CS/B&O SD40-2 7613, cuts off “on the fly” at the east portal of Mt. Airy Tunnel after assisting an eastbound coal drag over (or, more correctly, through) Parr’s Ridge on March 9, 1986.
At 2758 feet, Mt. Airy is the longest of the 9 tunnels on the 58 mile stretch between Point of Rocks and Relay on B&O’s Old Main Line.
